Thank you for the citation. Nevertheless, I hope that you can clearly see the difference between referring folks to an official company communication, and starting off with "I work at google..." IIRC, there's mandatory annual training about just this sort of thing.
This linked post doesn't say anything about Google Calendar.
It's not necessarily that I doubt you, it's just that the press release is pretty specific that consumer GMail isn't going to be used for ad customization from now on, and it seems like if it was everything in G-Suite that would be mentioned somewhere.
I don't suppose there's a list Google maintains anywhere online that shows which of their own products they use to aid with ad targeting?